I think we could do a prototype implementation of the API drafted here though:
http://lists.w3.org/Archives/Public/public-webapps/2013AprJun/0727.html
This also has support for the "chunked" mode.
I believe google is working on a spec draft based off of that. IIRC that draft has some small changes compared to the email above, but they are largely the same.
Anne, do you have a link to that draft?